ASTERACEAE. 395 



54. CHAENACTIS DC. 



Annual herbs, often more or less woolly, with com- 

 pound leaves and discoid heads mostly solitary and 

 peduncled. Involucre campanulate, the linear bracts 

 equal, uniserial, herbaceous. Receptacle flat, naked. 

 Corollas with short tube, long narrow throat and short 

 teeth, those of the outer row sometimes more ample 

 and resembling rays. Achenes slender, smooth. Pap- 

 pus of hyaline nerveless palese. 



Flowers yellow; pappus persistent. 



Stems branching near the base, the elongated 



peduncles scapiform. 1. C. lanosa. 



Stems branching above, not scapiform. 2. C. glahriuscula. 



Flowers not yellow. 



Pappus persistent; perennial with a woody 



base. 3. C. santolinoides. 



Pappus deciduous; tall annual. 4. C. artemisifolia. 



1. C. lanosa DC. Stems short, branching near the base, bearing 

 few-many long naked peduncles, 1-2 dm. high, the earlier scapiform; 

 herbage floccose-wooUy when young; leaves thickish, simply pin- 

 nately-parted into few narrowly linear lobes, or the uppermost 

 entire; heads about 12 mm. high; the outer flowers only moderately 

 enlarged, not surpassing the disk; involucral bracts nearly linear; 

 pappus of 4 equal long palese. 



Common on plains and foothills, especially in sandy soil. 



2. C. glahriuscula DC. Taller and more caulescent, branching 

 above, 2-3 dm. high, herbage thinly floccose, becoming glabrate; 

 peduncles long, stout; heads 15-20 mm. high; involucral bracts 

 glabrate, broader, thickish, obtuse; marginal flowers ample, much 

 exceeding the others; pappus of 4 equal narrowly oblong acutish 

 palese. 



Common on sandy soil or rocky ground in the lower hills and 

 along the coast. 



3. C. santolinoides Greene. Subacaulescent perennial; leaves 

 all crowded on short tufted shoots from a slightly ligneous crown, 

 white-tomentose, linear in outline with broad rachis, thickly beset 

 with small oblong obtusely few-lobed crispate divisions; peduncles 

 scapiform, 10-15 cm. long, simple or once or twice forked, glandular 

 and viscid; heads 12 mm. high, rather narrow; outer flowers scarcely 

 or not at all enlarged; pappus of 8-10 linear-ligulate palese a little 

 shorter than the flowers. 



In the higher altitudes of the San Gabriel and San Bernardino 

 Mountains, in open pine woods. June-August. 



4. C. artemisiaefolia Gray. Stems paniculately branched or 

 nearly simple, 3-8 dm. high, furfuraceous-pubescent, somewhat 

 viscid, above glandular-hirsute; leaves 2-3-pinnately divided or 

 parted into short linear or oblong lobes; heads loosely cymose- 



